Cutter-head



No. 753,528.. PATENTED MAR; 1, 1904.

F. STUTZMAN.

CUTTER HEAD.

No. 753,528 PATENTBD MAR. 1, 1904,

- ,P. STU'TZMAN.

CUTTER HEAD. APPLICATION FILED OUT. 30. 1903.

2 SHEETS-SHEET 2.

H0 MODEL.

.UNITED 1 STATES Patented March 1, 1904.

PATENT QFFICE.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 753,528, dated March 1,1904:.

Application filed October 30,1903.

To all whom it may concern.-

Be it known that I, FRANK STUTZMAN, a citizen of the United States,residing at Williams port, Lycoming county, State of Pennsylvania, haveinvented certain new and useful Improvements in Cutter-Heads, of whichthe following is a specification.

My invention relates to cutter-heads, and is designed particularly forthe purpose of securing a draw out and at the same time to provide aconstruction whereby the knife-blade may be adjusted to maintain itsparallelism with the cutter-head and to maintain also a constant oruniform relation thereto.

My invention comprises a cutter-head having a plurality of seatsdisposed about the same for the cutting-blades or knives, said seatsbeing in the form of shallow grooves with curved bottoms and extendingdiagonally; or at an incline longitudinally of the axis of thecutter-head, but not in a spiral direction in relation to the said head.

In carrying out my invention both the curve of the knife and thetransverse curve of the knife-seat are formed on a true circle, andtheknife-blade will fit the curved seat closely throughout its extent andin all positions to which it may be adjusted. 1

In the accompanying drawings, Figure 1 is an end view of thecutter-head. Fig. 2 is a side view looking from the point on at theright of Fig. 1. Fig. 3 is a view similar to Fig. 2 with one of theknife-blades in place. Fig. 4 is a plan view looking from the point Fig.

1, toward the axis of the cutter-head. Figs.

5, 6, and 7 show cross-sectional views taken on lines 5 5, 6 6, and 7 7showing so much of the cutter-head as will illustrate the relation ofdifferent parts of the same knife-seat to the cutter-head, it beingunderstood that these views are taken with the cutter-head remaining inone position. Fig. 8 is aview looking from one end of the cutter-head inthe direction of the dotted line 8 8 of Fig. 4;. Fig. 9' is a Viewillustrating how my cutter-head is formed from a cylindrical piece ofmaterial. Fig. 10 is a diagram to illustrate how the knife-blade may beformed from a cylindrical a 2 are equal.

Serial No. 179,228. (No model.)

shell so as to fit the curved seat of my cutterhead.

It is thought that the construction of my cutter-head will be bestunderstood by referring to the way in which it may be manufactured, andin this connection reference is had to Fig. 9, which shows a cylindricalpiece or head 1 with a milling-tool (indicated at 2) arranged to cut ashallow groove or seat therein, (indicated by the lines 3 and 4, whichrepresent the opposite margins of the said'shallow groove or seat.) Informing this shallow groove or seat the milling-tool is caused totraverse-the block of material along the line 2 2, which, as indicated,is at an angle to the axial line a z of the cylindrical piece ofmaterial from which the head is to be formed. 5

It will be noticed particularly that the inclined line .2 z crosses theline 2 2', representing the axial plane of the cutter-head at the pointa, which is centrally of the length of the cylinder, so that the twoangles on opposite sides of this central point a formed by the points zThe line 2 2 represents a line extending along the periphery of animaginary cylinder and parallel to the axis thereof, which cylinderwould be formed were thecurved surface-of the groove extendingtransversely to this line continued into the form of a cylinder. Theline 2 a, crossing, as it does, the axial plane at the point a, lies infront of the axial plane at one end an equal distance to that at whichit lies in rear of said axial plane at its other end.

We will suppose that the cylindrical piece is held with its axishorizontal and the cutting action of the milling-tool takes place always'inthe same horizontal plane, so that the line ,2 2, representing thebottom of the channel straight from end to end, is a horizontal one andparallel to the horizontal axial plane of the cylindrical piece fromwhich the cutter-;

head is to be made. From this it will be seen that. my channel is ofsuch form as would be made by taking a cylindrical piece of material andpresenting this to a millingtool, so that said milling-tool wouldtraverse said piece of material on a diagonal line or a line inclined tothe vertical axial plane of the cylindrical piece, the said cylindricalpiece being supposed to be maintained with its axis horizontally and themilling-tool also moving in a horizontal plane. By reason of this acutter-head is produced having seats inclined laterally to the axialplanes of the cutter-head, the said seats, however, not being of spiralform.

My invention is clearly distinguished from cutter-heads havingknife-seats arranged spirally thereabout, for it will be seen that aspirally-extending seat cannot be formed by a milling-tool passing overthe surface of a cylinder in a horizontal plane while the said cylinderis maintained constantly with its axis horizontally.

The effect of the above operation is to form a channel with itslongitudinal edges curved from end to end of the cutter-head, such edgesbeing indicated at 3 4 in Fig. 4. Figs. 5, 6, and 7 indicate sectionalviews of the channel or seat looking from the left of Fig. 4, and itwill be seen that the channel is of diiferent depths, that at the pointwhere the sectionline 6 6 extends being of greater depth than theportions at the ends of the seat or channel, this being. due to the factthat the milling-tool cuts deeper at the crest of the cylinder than itdoes at the opposite ends thereof, where the side begins to slope away,and this difference in depth results from the fact that the millingtooldoes not follow a spiral path around the cylindrical block, but cuts inthe same horizontal plane along the surface of the cylinder while saidcylinder is held with its axis horizontally.

Fig. 8 illustrates the fact that the channel or seat is formed on a truecircle in a direction at right angles to the line 2 2 extendingdiagonally of the said channel or groove from corner to corner.

In order to provide a knife for the cuttinghead as above described, itis necessary to provide a blade which will represent a part of acylinder the periphery of which is of the same curvature as thatrepresented by the segment of the circle 6 6, Fig. 8, and asillustrating how such a knife may be formed 1 reference is had to Fig.10, which indicates a cylindrical shell, the radius of which is the sameas that upon which the curve 6 6 in Fig. 8 is formed, but instead ofcutting out the knife with its longitudinal edges 7 and 8 extendingparallel with the axis of the cylinder the said blade is cut out fromthe cylindrical shell at an incline, so that its edges 7 and 8 will beinclined to the axial plane and will curve in a direction around thecircumference of the cylinder. A knife of this formation when fitted tothe channel or seat of the cutter-head will lie closely thereon from endto end, and it may be held by bolts 9 passing through slots 10 in theknife-blade and into the cutter-head. This knife-blade will have itsedge slightly curved from end to end, and it will produce a draw out onthe material being operated upon. The slots in the' cutter-blade arearranged parallel with eachother, and the said blade may be adjustedback and forth while maintaining its edge parallel with the edge of thechip-breaker 10. By reference to Fig. 10 the diameter of the piece ofcylindrical material from which the cutter-head is formed is indicatedat 11 11.

In the present instance the cutter-head is adapted to receive threecutter-knivesone upon each of the shallow seats or grooves 12, 13, and14:. The edges of these grooves are at a slight distance apart, and inorder to form the chip-breaker 10 the material of the cutter-head is cutaway at 15 between the edges of the seats or channels, so that thiscut-away portion lies some distance within the original circumference ofthe cylindrical piece, (indicated by the dotted line 16.) It will benoticed that the medial line of each knifeseat extends at an angle tothe radial plane.

tion to that of the axis of the cutter-head, substantially as described.

3. A cutter-head comprlslng a p1ecehav1ng shallow channels or groovesextending longitudinally thereof, said grooves being formed.

on a true circle transversely and having their bottom portions straightfrom end to end and extending at an angle to an axial plane of thecutter-head, and knives with edges curved longitudinally arrangedadjustably on the seats, substantially as described.

4:. In combination with a cutter-head having non-spiral seats concavedtransversely and extending longitudinally of the cutter-head at an angleto an axial plane, said cutter-head having chip-breakers between thesaid seats.

5. In combination with a cutter-head having non-spiral seats extendinglongitudinally of the said head and curved transversely and knivesforming the section of a cylinder whose radius is the same as thetransverse curve of the groove or channel and whose cutting edge is,

curved longitudinallyv and results from the inclination of the 'saidedge in relation to the axial plane of the imaginary cylinder and partof which the knife-blade represents.

6. A cutter-head having non-spiral seats extending from end to end at aninclination to the radial or axial planes which pass through the centralpoints of said seats, said seats being curved transversely 0n atruecircle, knives fitted to said seats and having cutting edges curved fromend to end and means for ad- 10 justably holding the knives to the saidseats and to maintain the parallel relation of the cutting edge to thechip-breaker in all positions, said cutting edge having a draw out onthe material, substantially as described.

In testimony WhereofI aflix my signature in 5 presence of tWo Witnesses.

FRANK STUTZMAN.

Witnesses:

A. R. JACKSON, H. S. OAHERT.

